<!DOCTYPE html>
<head>
    <meta charset="UTF-8">
    <title>边框border</title>
    <style type="text/css">
        div{
            width:500px;
            height:500px;
            /* border:10px solid green; */
            border:10px;
            /* border-style:groove; 默认none; dashed短虚线; dotted圆点虚线; double双实线; groove 有点3D感觉的线; hidden */
            /* border-top-style:dashed;
            border-right-style:dotted;
            border-bottom-style:double;
            border-left-style:outset; */
            border-style:dashed dotted double outset;
        }
    </style>
</head>
<body>
    <div></div>
</body>
</html>